[time-nuts] 10544A Oscillator Question

Richard (Rick) Karlquist richard at karlquist.com
Sat Feb 10 23:07:37 EST 2007

I can confirm that the 10811 is guaranteed to work
in any 10544A socket.  In particular, the 10811 is
designed to never draw more current than a 47 ohm
resistor, to be backward compatible with the 10544.
I don't know of any particular reason why a 10811
shouldn't work in a 10544 socket, except that some
instruments played shenanigans with the power supply
during warmup.  For example, the 5334A has a very 
wimpy power supply that sags down to 12V or so when
the 10811 is warming up.  The 10544 may or may not
work on such a low oven voltage.  For the 5334B, I
redesigned the power supply to make it stiffer.  There
is probably little or no chance of damaging the 
oscillator, so you might as well try it and see what

Rick Karlquist N6RK

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Jason Rabel
> Sent: Saturday, February 10, 2007 7:02 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] 10544A Oscillator Question
> I believe you can find the 10544A info on the HP Archive website.
> From what I have read you can use a 10811A (newer model) to 
> replace a 10544A
> (older model) as it is backwards compatible. However the reverse is not
> always true.
> What piece of equipment are you trying to plug it into? I'm sure 
> some of the
> guys here would be able to tell you if it is okay to or not.
> Jason
> > Is the 10544A interchangeable with the 10811A ?
> > If I plug the 10544A into the controller board which
> > previously held a 10811A will I fry anything ?
> > 
> > Anyone have a manual for the 10544A ?
> > 
> > Thanks,
> > 
> > 73, Dick, W1KSZ 
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